Pulverized fuel burner



DCC. 8, 1931. E PINCKARD 1,835,332

PULVERIZED FUEL BURNER Filed Aug. l0, 1929 l, l o

i 543; f7 Mm Patented Dec. 8, 1931 UNITED STATES PATENT OFFICE LEE E. PINCKARD, OF GOLIJENQ COLORADO rULvERIzED. rum. BURNER Application filed August 1o, ma Seriana. 884,978..

desired to be understood, however, that the particular burner is not limited to this use but can be employed for all heating purposes where it is desired to make use of pulverized or line fuels.

The principal object of the invention is to provide a pulverized fuel burner in which an air blast will act'both to support combustion and to automatically feedthe fuel to the fire.

l Other objects and advantages reside in the detail construction of the invention,` which is designed for simplicity, economy,

and efficiency. These will become more -apparent from the following description.

In the followingv detailed description of the invention referenceY is had to the accompanying drawings which form a part hereof. Like numerals refer to like partsin all viewsV of the drawings andk throughout the description. In the drawings: f Fig. ,l is a vertical section through a brooder stove in which the invention is embodied.

Fig. 2 is a horizontal section through the stove of Fig. l, taken on the line 2 2, of that figure. l

Fig. 3 is an enlarged detail section through the air blast ring illustrating the feeding action.

Y The illustrated embodiment of the inven' tion comprises a stove 10 which when em-fV ployed as a brooder stove is preferably set into the floor 11 of the brooder house. The

bottom of the stove 10 is provided with a lining 1Q, of fireclay or similar heat resisting material and a stack 13 is provided adjacent the upper portion of the stove.

Extending downwardly within the center of the stove 10 is a fuel feed tube 14 provided at its upper extremity with a fuel hopper 15. The bottom of the feed tube 14 is spaced above the bottom of the stove 10 a` sulcient distance'so thatthe fuel can form a natural fuel cone 16 upon the stove bottom. The

angle ofthe side of the fuel cone t16 is equal to the natural angle of reposeofthe fuel. v Ablast ringbl lies upon the bottom ofthe l stove 10.' ,The lblast ring 17fis `an annular air pipe terminating at one extremity in a clean-out cap 18V and at its, other extremity ina-'blower'lS ofV any suitable design. The

blast ring 17 is provided` with perforations 20 which extend approximately" entirely around Vits `periphery. The -perforations 20 are preferably'positionedtothev outside of averticalV center line of thering asillus-V Vtrated. in 3, so that 'they will?` direct i Y air blastsupwardlyand'outwardly fromthe blaming; ,t .,Y Y When using thefs'tove for brooding purosesa "hover 21 is provided whichextends t outwardly and downwardly from'theup'per 70 portion of: theV feed' tube 14 so'that" itgwill reflect 'the .heat from l the stove?? A10 toward the 'floo`r.` Itwill` be notedth'atithe' hover is positioned above the stove vso thatiheatarisl ing from thestove 'top vwill also lbediiected 75 toward the Iflor 11 whereit willrbemore effective in warming vthe chicks. l, Y `A door 22 is providedV for accesstothe in teriorof lthe stove should `it be'necessary to mlke repairs and Iclean out clinkersandthe 80 lie`.V-'

' Operation l It is-desiredL to call`attention to the unique and effective method of operation "of the 85 burner. Whenonce ignited'the blast from the blower 17 blows the fuel upwardly entirely around -thefbottom of the fuel? cone 16" causing itv to burn in the vspace in'theuppeil part y,

ofthe stove 10. As the Vfuelis'blow up- 90 wardly by theblast fromgth'eiperforation's 20,

additional fuelwillV How downthe sides of the' cone 16' from the-feed tube 14.1 Thus, the air blast serves'a `double purpose.` I't'suppli'es oxygen forthecombustion and it operates to 95 automatically` -feed fresh Ifuel from the tubellia p, ,"iv. `The blower 19 canbe connectedlin circuit with any suitable thermostat `(not shown) so abo that when the desired degree of he'atfhas been reached the blower will stop. This will allow the cone of fuel 16 to smoulder and burn internally similar to the spontaneous combustion of slack coal piles. When additional heat is desired the blower again starts and the powdered fuel is again blown upwardly from the sides of the fuel cone 16 to burn in an in* tense blaze in the top of the stove 10.

A stove constructed according to the disclosures of this invention has been in constant use in a brooder house for the past ten months and has never been ignited since the initial ignition ten months ago. When the blower 19 is stopped the stove 10 becomesso cool that it feels cool to the hand and yet when the blower is started it becomes immedi atelv heated.

While a specific form of the improvement has been described and illustrated herein, it is desired to be understood that the same may be varied within the scope of the appended claims. without departing from the spirit of the invention. v

Having thus described the invention. what is claimed and desired secured by Letters Patent is 1. A pulverized fuel burner comprisingtan annular horizontal perforated pipe: a substantiallv vertical feed tube terminating concentricallv above said pipe a sufficient distance to allow the fuel from said tube to form a natural cone. the edges of which will extend over said pipe. said perforations beingV directed so as to blow fuel upwardly and outwardlv around. the edges of said cone? and means for supplyinfrairto said pipe.

2. A pulverized fuel burner comprisine: a stove having a top and bottom: a heat resistinq' lining in the bottom of said stove: a fuel feed tube extending downwardly within the center of said stove and terminatino: a con siderable distance above said lining so that when said tube is filled with fuel it will iiow from the lower extremity thereof and form a natural cone in the bottom of said stove: a hopper carried at the top of said fuel feed tube so as to direct fuel therein: and an annular pipe resting in the bottom of said stove provid ed with perforations. said perforations being formed in the ton of said pipe so as to direct air upwardly through'the surface of said cone.

8. A pulverized fuel burner compris-ing: a stove having` a top and bottom: a heat resistiurY lininrr inthebottom of said stove: a fuel .feed tubeI extending downwardly within the Center of said stove and terminating a considerable distance'above said lining so that when said tube is filled with fuel it will flow from the lower extremity thereof and form a. natural fuel cone in the bottom of said stoif'c; a hopper carried at the top Vof said fuel feed tube so as to direct fuel therein; an annular pipe resting in the bottom of said LEE E. PINCKARD. 

